Here is a rare one for you: a very fine thumbnail-sized Perovskite from a seldom referenced location in Russia, with an old Lazard Cahn label added for good measure.
Dimensions: 2.2 x 2.4 x 2.2cmSpecies: Perovskite
Locality: Achmatowsk, near Zlatoust, Ural Mtns., Siberia, Russia